This site is for astronomy including stars, planets, asteroids, comets, satellites, universe, exploration, solar systems, and etc...

1)http://www.nasa.gov/
This is simply NASA's homepage because it seemed like the obvious thing to put here since they have information that is pertinent to just about everyone. This would be for students that want more information on space.

2) http://www.nasa.gov/audience/foreducators/index.html
NASA's page is divided up by grade level. There are SO many projects with which NASA is involved that promote education and outreach. NASA also has grants that they award to teachers who want to integrate atmospheric science or earth science into their curricula. Look closely as you navigate this page! lots of good info.

3)http://www.jpl.nasa.gov/education/teachers/
Resources for teachers from NASA's Jet Propulsion Laboratory. Includes classroom activities, pictures, videos, links to information about current NASA missions, and tour information for teacher professional development.

4)http://www.asc-csa.gc.ca/eng/educators/resources/astronomy/default.asp
The Canadian Space Agency also offers lots of resources for educators including complete lesson plans.

5)http://www.phy6.org/stargaze/Sintro.htm
"From Stargazers to Starships" by David P. Stern offers "a coherent, self-contained [astronomy] course at the high-school level" including lesson plans and math reviews.

6). The textbook "Fundamental Astronomy" by Karttunen et. al. is a great resource for sample problems applicable for upper level high school physics and math classes. The book can be found used for a reasonable amount and could provide astronomy based physics and math word problems that many students would find interesting.

7) http://thinkzone.wlonk.com/SS/SolarSystemModel.php
This site lets students set a scaled down size for the sun (eg. 2 meters) This then tells the students the actual average distances between the planets and the sun and the scaled down distances as well. If you input your coordinates into the provided space, the website will create the orbits of the planets on google maps, with the sun being your current location.

8) What is a planet? (NASA)
http://www.nasa.gov/audience/foreducators/9-12/features/what-is-a-planet.html
NASA has put together a section of their website that explores what is a planet. The pages explore how a planet is defined and why it has become a relevant topic in recent years. The page has many resources for topics of various grade levels and teachers.